AWS DEV-A Practice Exam 2 (training mode)

Question 1

What are the AWS Elastic Beanstalk Deployment policies?

Answer 1

Rolling, Rolling with additional batch, All-at-Once and Immutable.

Question 2

AWS Elastic Beanstalk Deployment policy
Why is All at once the fastest deployment?

Answer 2

Deploys the new version to all instances simultaneously.

All your instances are out of service while the deployment takes place.

Question 3

What are two major downsides to All at once deployment policy?

Answer 3

You will experience an outage while the deployment is taking place – not ideal for mission-critical systems.

If the update fails, you need to roll back the changes by re-deploying the original version to all your instances

Question 4

AWS Elastic Beanstalk Deployment policy
Rolling come at no additional cost but has a long ___________ ______

Answer 4

No additional cost.
Long deployment time.

Question 5

AWS Elastic Beanstalk Deployment policy
Rolling with additional batch: is like Rolling but

Answer 5

launches new instances in a batch ensuring that there is full availability

Question 6

AWS Elastic Beanstalk Deployment policy

Rolling with an additional batch is good for ______________ environments but is a ____________ deployment model.

Answer 6

Good for production environments.

Longer deployment model

Question 7

AWS Elastic Beanstalk Deployment policy
Immutable:
Launches new instances in a new ____ and deploys the version update to these instances before___________ ___________ to these instances once healthy.

Answer 7

Launches new instances in a new ASG and deploys the version update to these instances before swapping traffic to these instances once healthy.

Question 8

DynamoDB:

Each API call to read data from your table is a

Answer 8

read request.

Question 9

For items up to 4kb in size, 1 RCU can perform how many strong and eventually consistent reads.

Answer 9

one strongly consistent read request per second.
two eventually consistent read requests per second.

Question 10

Occasionally ,you may receive the 400 ThrottlingException error for PutMetricData API calls in Amazon CloudWatch. What 3 things can you do to mitigate this?

Distribute your API calls ________ ____ _______
Combine as many ________ as possible into a ________ API call
Retry your call with exponential ________ and ________

Answer 10

Distribute your API calls evenly over time
Combine as many metrics as possible into a single API call
Retry your call with exponential backoff and jitter

Question 11

Amazon API Gateway is an AWS service for ___________ , ___________, ___________, ___________, and ___________ REST and WebSocket APIs at any scale

Answer 11

Amazon API Gateway is an AWS service for creating, publishing, maintaining, monitoring, and securing REST and WebSocket APIs at any scale

Question 12

A stage is a named reference to a _________ , which is a _________ of your API

Answer 12

A stage is a named reference to a deployment, which is a snapshot of your API

Question 13

How would you query how much provisioned capacity is actually being used in a Amazon DynamoDB table?

Monitor the ___________________________________ and ____________________________________ over a specified _________ period

Answer 13

Monitor the ConsumedReadCapacityUnits and ConsumedWriteCapacityUnits over a specified time period

Question 14

An API Gateway REST API is a collection of HTTP ______________ and _____________ that are integrated with backend HTTP ________, ________ ________, or other AWS services.

Answer 14

An API Gateway REST API is a collection of HTTP resources and methods that are integrated with backend HTTP endpoints, Lambda functions, or other AWS services.

Question 15

Blue / Green deployment:

How does a Blue/Green Deployment achieve Zero downtime and release facility.

Answer 15

By Creating a new “stage” environment and deploying new updates there.

Question 16

Amazon SNS allows applications to send time-critical messages to multiple ___________ through a _____ mechanism, eliminating the need to periodically _____ for updates.

Answer 16

Amazon SNS allows applications to send time-critical messages to multiple subscribers through a “push” mechanism, eliminating the need to periodically “poll” for updates.

Question 17

Amazon ElastiCache is a popular choice for real-time use cases like (5)

Answer 17

• Gaming
• Caching
• Queuing
• Session Stores and
• Real-Time Analytics

Question 18

ElastiCache is a fully managed, low latency, in-memory data store that supports either ____________ or _______.

Answer 18

ElastiCache is a fully managed, low latency,** in-memory** data store that supports either Memcached or Redis.

Question 19

Amazon DynamoDB Accelerator also known as DAX is a fully ________ __-________ ________ for DynamoDB

Answer 19

Amazon DynamoDB Accelerator also known as DAX is a fully managed in-memory cache for DynamoDB

Question 20

Lambda triggers allow you to build applications that react to data modifications in DynamoDB ________ via DynamoDB ___________

Answer 20

Lambda triggers allow you to build applications that react to data modifications in DynamoDB tables via DynamoDB streams.

Question 21

AWS SAM templates are an extension of AWS _______________________ templates, with some additional components that make them _______ to work with.

Answer 21

AWS SAM templates are an extension of AWS CloudFormation templates, with some additional components that make them easier to work with.

Question 22

To create a DynamoDB table using an AWS SAM template the Developer can use the AWS::Serverless::_____________ resource type which creates a DynamoDB table with a _________ attribute primary key. It is useful when data only needs to be accessed via a primary key.

Answer 22

To create a DynamoDB table using an AWS SAM template the Developer can use the AWS::Serverless::SimpleTable resource type which creates a DynamoDB table with a single attribute primary key. It is useful when data only needs to be accessed via a primary key.

Question 23

CloudWatch metric filters do not ____________ filter data. Filters only publish the metric data points for events that happen ______ the filter was created.

Answer 23

CloudWatch metric filters do not retroactively filter data. Filters only publish the metric data points for events that happen after the filter was created.

Question 24

What are the steps to determine the number of RCUs required to handle 100 strongly consistent reads per/second with an average item size of 5KB, perform the following steps:

Answer 24

1. Determine the average item size by rounding up the next multiple of 4KB (5KB rounds up to 8KB).
2. Determine the RCU per item by dividing the item size by 4KB (8KB/4KB = 2)
3. Multiply the value from step 2 with the number of reads required per second (2×100 = 200).

Question 25

To determine the number of RCUs required to handle 200 eventually consistent reads per/second with an average item size of 12KB, perform the following steps:

Answer 25

1. Determine the average item size by rounding up the next multiple of 4KB (12KB rounds up to 12KB). 2. Determine the RCU per item by dividing the item size by 8KB (12KB/8KB = 1.5). 3. Multiply the value from step 2 with the number of reads required per second (1.5×200 = 300).

Question 26

You can create Cross- ________ and Cross- ________ dashboards, which summarize your CloudWatch data from multiple AWS ________ and ________ into one ____________

Answer 26

You can create Cross- **Account** and Cross- **Region** dashboards, which summarize your CloudWatch data from multiple AWS **accounts** and **Regions** into one **dashboard**.

Question 27

AWS CodePipeline is a continuous delivery service you can use to ________, ________, and __________ the steps required to release your software

Answer 27

**Model, visualize, and automate**

Question 28

CloudFormation is not triggered by changes in a source ________ ____________. To deploy updates to CloudFormation you must create ________ ____

Answer 28

CloudFormation is not triggered by changes in a source **code repository** To deploy updates to CloudFormation you must create ** change sets**

Question 29

CodeBuild is used for ________ code, running unit ____ and creating the ____________ package. But it does not manage the ____________ of the code.

Answer 29

CodeBuild is used for **compiling** code, running unit **tests** and creating the **deployment** package. But it does not manage the **deployment** of the code.

Question 30

Server-side encryption is about ____________ data at ____

Answer 30

**protecting, rest**

Question 31

If you followed AWS best practices and are still having throttling issues with your API's what actions can you take?

Answer 31

You can request a limit increase. Note: Increasing the rate limit can have a high financial impact on your AWS bill.”

Question 32

When you deploy your API to a stage it is given a unique ____ that contains the ________ ________.

Answer 32

**URL ; stage name.**

Question 33

The ____ assigned to an API stage can be used to direct customers to your URL based on the ________ or the _______ you’d like them to use.

Answer 33

**URL ; stage, version**

Question 34

You can monitor Amazon DynamoDB using CloudWatch, which collects and ________ raw data from DynamoDB into readable, near real-time ______.

Answer 34

**processes, metrics**

Question 35

By default, the DynamoDB write operations (PutItem, UpdateItem, DeleteItem) are ____________________: Each operation ________ an existing item that has the specified ________ key.

Answer 35

By default, the DynamoDB write operations (PutItem, UpdateItem, DeleteItem) are **unconditional**: Each operation **overwrites** an existing item that has the specified **primary** key.

Question 36

What is the function of **conditionalwrites** in DynamoDB? Conditional writes are helpful in cases where __________ users attempt to modify the _____ item

Answer 36

Conditional writes are helpful in cases where **multiple** users attempt to modify the **same** item

Question 37

DynamoDB Batch writes is way of making multiple ___ or _________ API operations in a ______ batch operation.

Answer 37

DynamoDB Batch writes is way of making multiple **put** or **delete** API operations in a **single** batch operation.

Question 38

With Conditional writes you could prevent an UpdateItem operation from ____________ an item if one of its attributes has a certain ______

Answer 38

With Conditional writes you could prevent an UpdateItem operation from **modifying** an item if one of its attributes has a certain **value**.

Question 39

Conditional writes are helpful in many situations. For example, you might want a PutItem operation to succeed only if there is not already an item with the same________ ____

Answer 39

Conditional writes are helpful in many situations. For example, you might want a PutItem operation to succeed only if there is not already an item with the same **primary key**

Question 40

Sticky sessions are a mechanism to _______ requests to the same ________ in a target group.

Answer 40

**route, target**

Question 41

Sticky sessions are useful for servers that maintain ________ ________ information in order to provide a ____________ experience to clients.

Answer 41

Sticky sessions are useful for servers that maintain **session state** information in order to provide a **continuous** experience to clients.

Question 42

To use sticky sessions, the clients must ________ cookies.

Answer 42

**support**

Question 43

A new application will be hosted on the domain name dctlabs.com using an Amazon API Gateway REST API front end. The Developer needs to configure the API with a path to dctlabs.com/products that will be accessed using the HTTP GET verb. How MUST the Developer configure the API?

Answer 43

Create a **/products** resource Create a **GET products** method

Question 44

A microservices architecture is where you have many small ____________ components of an application that are loosely ________

Answer 44

A microservices architecture is where you have many small **individual** components of an application that are loosely **coupled**

Question 45

GetItem provides **____________** consistent read by default. If your application requires a strongly consistent read, set **____________** to true

Answer 45

GetItem provides **eventually** consistent read by default. If your application requires a strongly consistent read, set **ConsistentRead** to true

Question 46

DynamoDB Accelerator (DAX) is an in-memory cache that improves **____** performance by **________** data.

Answer 46

DynamoDB Accelerator (DAX) is an in-memory cache that improves **read** performance by **cachenig** data.

Question 47

A Lambda Alias is like a **________** to a specific function **________**

Answer 47

A Lambda Alias is like a **pointer** to a specific function **version**

Question 48

If you work with multiple resources, you can manage them as a ________ on one dashboard rather than ________ from one AWS service to another for each task.

Answer 48

**group ; move**

Question 49

Client-side encryption provides _________ protection for your data from its **______** to **______** in DynamoDB.

Answer 49

Client-side encryption provides **end-to-end** protection for your data from its **source** to **storage** in DynamoDB.

Question 50

DynamoDB Streams captures a _______ _______ of item-level modifications in any DynamoDB table and stores this information in a log for up to ____ hours.

Answer 50

**time-ordered sequence ; 24**

Question 51

With adaptive **_________________**, you can configure your user pool to **____** suspicious sign-ins or add second factor authentication in response to an increased **____** level.

Answer 51

With adaptive **authentication**, you can configure your user **pool** to block suspicious sign-ins or add second factor authentication in response to an increased **risk** level.

Question 52

If Amazon Cognito suspects suspicious activity at sign-in you can take the following actions: (3)

Answer 52

-Allow – Users can sign in without an additional factor. -Require MFA -Block all sign-in attempts

Question 53

API Gateway: ________ templates are used for ________ data.

Answer 53

**Mapping ; transforming**

Question 54

The /tmp directory can be used with a _____ _________ for storing temporary files within the ________ context.

Answer 54

**Lambda function ; execution**

Question 55

Lambda Function: There is a limit of ____mb storage space in the /tmp directory

Answer 55

**512 MB**

Question 56

API Gateway: A ________ plan specifies who can access one or more deployed API stages and methods along with how ____ and how ____ they can access them.

Answer 56

**usage ; much ; fast**

Question 57

API Gateway: Usage plan uses API ____ to identify API ____ and meters access to the associated API ______ for each key.

Answer 57

**keys ; clients; stages**

Question 58

When IAM roles for Amazon ECS tasks is ________, applications sign their AWS API requests with AWS _______

Answer 58

**enabled ; credentials**

Question 59

A developer received the following error message during an AWS CloudFormation deployment: **DELETE_FAILED (The following resource(s) failed to delete: (sg-11223344).) ** Which action should the developer take to resolve this error?

Answer 59

You'd have to delete the stack in the console and then select to retain the resource(s) that failed to delete. ## Footnote This can also be achieved from the AWS CLI:

Question 60

A Developer is deploying an application using Docker containers running on the Amazon Elastic Container Service (ECS). The Developer is testing application latency and wants to capture trace information between the microservices. How would he meet this requirement? Create a Docker image that runs the _______ daemon, upload it to a Docker image **______________**, and then **_______** it to the Amazon ECS cluster.

Answer 60

Create a Docker image that runs the **X-Ray** daemon, upload it to a Docker image **repository**, and then **deploy** it to the Amazon ECS cluster.

Question 61

AWS X-Ray is a service that collects **____** about requests that your **____________** serves

Answer 61

AWS X-Ray is a service that collects **data** about requests that your **application** serves

Question 62

AWS X-Ray provides tools you can use to ____, ____, and gain insights into that data to identify issues and opportunities for ____________

Answer 62

AWS X-Ray provides tools you can use to **view, filter**, and gain insights into that data to identify issues and opportunities for **optimization**

Question 63

You can run the X-Ray daemon on the following operating systems on Amazon EC2: (3)

Answer 63

Amazon Linux Ubuntu Windows Server (2012 R2 and newer)

Question 64

The X-Ray daemon uses the AWS ____ to upload trace data to X-Ray, and it needs AWS ________ with permissions to do that.

Answer 64

**SDK ; credentials**

Question 65

Cross-origin resource sharing (CORS) defines a way for client web applications that are loaded in one domain to ______ with _______ in a different domain.

Answer 65

**interact with resources**